Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, -1), (0, -1, 0), (0, 0, 1), (1, 1, 0)}.
A150137
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, -1), (0, -1, 0), (0, 0, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =73a(5) =271a(6) =1064a(7) =4212a(8) =17196a(9) =70596a(10) =296012a(11) =1245082a(12) =5318268a(13) =22764797a(14) =98594587a(15) =427635358a(16) =1872119304a(17) =8204325414a(18) =36227766180a(19) =160091182728a(20) =711920762932
External references
- oeis: A150137